Топ-100 ★ Free online encyclopedia. Did you know? page 234

★ Free online encyclopedia. Did you know? page 234














Gliese 42

Gliese 42 is a star in the southern constellation of Sculptor. It is too faint to be seen with the naked eye, having an apparent visual magnitude of +7.3. The annual parallax shift of 70.56 mas provides a distance estimate of 46 light years. It h ...


Gliese 829

Gliese 829 is a double-lined spectroscopic binary system of two red dwarf stars in the constellation of Pegasus. They have a high proper motion of 1.08 arcseconds per year along a position angle of +69.58°. Based upon parallax measurements, the s ...


Gliese 880


HD 42936

HD 42936 is a binary star composed of an orange main-sequence star and an L-type dwarf star just massive enough to burn hydrogen, located approximately 153 light-years away in the constellation of Mensa, taking its primary name from its Henry Dra ...


HR 1046


HR 1204


S Reticuli


3C 454.3

3C 454.3 is a blazar located away from the galactic plane. It is one of the brightest gamma ray sources in the sky, and is the most luminous astronomical object ever observed, with a maximum absolute magnitude of -31.4. It has the brightest blaza ...


Moving group


AB Doradus moving group

AB Doradus Moving Group is a group of about 30 associated stars that are moving through space together with the star AB Doradus. A moving group is distinguished by its members having about the same age, composition and motion through space. Hence ...


Hercules stream

The Hercules stream is a large moving group of stars that are trailing behind the local rate of galactic rotation and are heading further out in the disk. Members of this stream may sometimes be referred to as Hercules stars. This stream was firs ...


Hyades Stream

The Hyades Stream is a large collection of scattered stars that also share a similar trajectory with the Hyades Cluster. In 1869, Richard A. Proctor observed that numerous stars at large distances from the Hyades share a similar motion through sp ...


Zeta Herculis Moving Group

Zeta Herculis Moving Group is a set of stars that share a common motion through space. The existence of this moving group was first published in 1958, I. Eggen Olin. Based on high speed movement of the star Zeta Hercules via space, he searched fo ...


Demons Run


Stump Asteroid


Volcanic Asteroid


Westbrook Nebula

Westbrook Nebula is an aspherical protoplanetary nebula which is located in the constellation Auriga. It is being formed by a star that has passed through the red giant phase and has ceased nuclear fusion at its core. This star is concealed at th ...


List of minor planets named after animals and plants


List of minor planets named after rivers

1323 Tugela River, South Africa. 1264 Letaba River, South Africa. 1490 Limpopo River, South Africa. 1305 Pongola River, South Africa. 1032 Pafuri Triangle, South Africa. 35295 Omo.


PSR J0740+6620

PSR J0740+6620 is a neutron star in a binary system with a white dwarf, located 4.600 light years away. It was discovered in 2019, by astronomers using the Green Bank Telescope in West Virginia, U.S., and confirmed as a rapidly rotating milliseco ...


SDSS J1240+6710

SDSSJ1240+6710 or SDSS J124043.01+671034.68, nicknamed Dox, is a white dwarf with an atmosphere of almost pure oxygen discovered by Kepler de Souza Oliveira, Detlev Koester and Gustavo Ourique. The atmosphere also has a detectable amount of magne ...


Gliese 229B


SX Phoenicis variable

An SX Phoenicis variable is a type of variable star. These stars exhibit a short period pulsation behavior that varies on time scales of 0.03–0.08 days. They have spectral classifications in the range A2-F5 and vary in magnitude by up to 0.7. Com ...


Emission-line star


LkHα 101


The Magnificent Seven (neutron stars)

The Magnificent Seven is the informal name of a group of isolated young cooling neutron stars at a distance of 120 to 500 parsecs from Earth. These objects are also known under the names XDINS or simply XINS.


Rotating radio transient

Rotating radio transients are sources of short, moderately bright, radio pulses, which were first discovered in 2006. RRATs are thought to be pulsars, i.e. rotating magnetised neutron stars which emit more sporadically and/or with higher pulse-to ...


RRAT J1819-1458

RRAT J1819-1458 exhibits sporadic pulses of radio emission. It has a rotation period of 4.26 seconds and a slow-down rate which implies it has a dipole magnetic field strength higher than all other RRATs. In fact its magnetic field is stronger th ...


Runaway stars


Blue large-amplitude pulsator

A Blue large-amplitude pulsator is a proposed class of pulsating variable star. They are extremely rare, with only 14 being known after examining around a billion stars from the Optical Gravitational Lensing Experiment survey.


DY Persei variable

DY Persei variables are a subclass of R Coronae Borealis variables. They are carbon-rich asymptotic giant branch stars that exhibit pulsational variability of AGB stars and irregular fades similar to R CrB stars. The star dy Persei is the prototy ...



The kappa opacity mechanism is the driving mechanism behind the changes in luminosity of many types of pulsating variable stars. The term Eddington valve has been used for this mechanism, but this is increasingly obsolete. Here the Greek letter K ...


EPIC 203771098

EPIC 203771098 commonly shortened to EPIC 2037 is a bright Sun-like G3 type star located 540 ly away in the constellation Scorpius. The star is known to hosts two sub-Saturn planets, EPIC 2037 b, as well as EPIC 2037 c.


Anomalous X-ray pulsar

Anomalous X-ray pulsars are now widely believed to be magnetars - young, isolated, highly magnetized neutron stars. These energetic X-ray pulsars are characterized by slow rotation periods of ~2–12 seconds and large magnetic fields of ~10 13 –10 ...


Irregular variable

An irregular variable is a type of variable star in which variations in brightness show no regular periodicity. There are two main sub-types of irregular variable: eruptive and pulsating. Irregular eruptive variables are divided into three catego ...



The aorta is the main and largest artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries. The aorta distributes oxygenated blood to all parts of the ...


Atrioventricular node

The atrioventricular node or AV node is a part of the electrical conduction system of the heart that coordinates the top of the heart. It electrically connects the atria and ventricles. The AV node lies at the lower back section of the interatria ...


Atrioventricular septum

The atrioventricular septum is a septum of the heart between the right atrium and the left ventricle. Although the name "atrioventricular septum" implies any septum between an atrium and a ventricle, in practice the divisions from RA to RV and fr ...


Atrium (heart)

The atrium is the upper chamber through which blood enters the ventricles of the heart. There are two atria in the human heart – the left atrium receives blood from the pulmonary circulation, and the right atrium receives blood from the venae cav ...


Bachmanns bundle

In the hearts conduction system, Bachmanns bundle is a branch of the anterior internodal tract that resides on the inner wall of the left atrium. It is a broad band of cardiac muscle that passes from the right atrium, between the superior vena ca ...


Bundle branches

The bundle branches, or Tawara branches, are offshoots of the bundle of His in the hearts ventricle. They play an integral role in the electrical conduction system of the heart by transmitting cardiac action potentials from the bundle of His to t ...


Cardiophrenic angle

The cardiophrenic angle is the angle between the heart and the diaphragm, as seen on imaging. There are two cardiophrenic angles, however the one on the right is obscured by the cardiohepatic angle.


Tendon of Todaro

The chordae tendineae, colloquially known as the heart strings, are tendon-resembling fibrous cords of connective tissue that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart. Chord sectiones about 80% collag ...


Interventricular septum

The interventricular septum is the stout wall separating the ventricles, the lower chambers of the heart, from one another. The ventricular septum is directed obliquely to the right, and curved with the convexity toward the right ventricle, its f ...

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